Gefen gaba da baya na da'irar pcb asali ne yadudduka na tagulla. A cikin kera da'irori na pcb, ko da an zaɓi Layer tagulla don ƙimar farashi mai canzawa ko ƙari da ragi mai lamba biyu, sakamakon ƙarshe shine ƙasa mai santsi kuma marar kulawa. Ko da yake abubuwan da ke cikin jiki na jan ƙarfe ba su da daɗi kamar aluminum, baƙin ƙarfe, magnesium, da dai sauransu, a ƙarƙashin yanayin ƙanƙara, jan ƙarfe mai tsabta da oxygen suna da saukin kamuwa da iskar oxygen; la'akari da kasancewar co2 da tururin ruwa a cikin iska, saman duk jan karfe Bayan haɗuwa da gas, wani redox zai faru da sauri. Idan aka yi la'akari da cewa kauri daga cikin tagulla Layer a cikin PCB circuit ne ma bakin ciki, da jan karfe bayan iska hadawan abu da iskar shaka yanayin zai zama wani kwatsam yanayin wutar lantarki, wanda zai ƙwarai cutar da kayan lantarki halaye na duk PCB da'irori.

Domin mafi kyawun hana iskar oxygen da tagulla, da kuma raba sassa na walda da mara walda na da'ira na pcb a lokacin waldawar lantarki, da kuma inganta yanayin da'irar pcb, injiniyoyin fasaha sun ƙirƙira na musamman Architectural. Rufi. Irin wannan rufin gine-ginen ana iya goge shi cikin sauƙi a saman da'irar PCB, wanda ke haifar da kauri na layin kariya wanda dole ne ya zama siriri kuma yana toshe hulɗar jan ƙarfe da gas. Ana kiran wannan Layer jan karfe, kuma albarkatun da ake amfani da su shine abin rufe fuska